Thursday, December 16, 2010

Precast concrete spiral stair

  • in-situ RC landing 
  • PCC cap ring 
  • Steel tube taken to handrail height and capped 
  • 500 dia shaft . 
  • Cover plate 
  • Spacer tube 
  • PCC tread . 
  • Rounded -headed nut 
  • 150 max overlap of treads 
  • Holes for balusters
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